Average Monthly Sunshine in O'Fallon (IL)

The graphs on this page shows the average number of hours per month and per day that O'Fallon receives direct sunlight. The numbers are calculated over a 30-year period to provide a reliable average.

Monthly hours of sunshine

Those who love seasonal contrasts will appreciate O'Fallon. Expect long, bright days with 311 hours in July and darker periods with just 128 hours in December. The total annual amount of sun is 2612 hours.

Daily hours of sunshine

In O'Fallon, summer days are longer and more sunny, with daily sunshine hours peaking at 10.4 hours in July. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 4.3 hours.

O'Fallon’s total hours of sunshine compared to other major cities

O'Fallon enjoys an average of 2612 hours of sunshine annually. Let’s compare this with some popular tourist destinations:

Athens, Greece, enjoys 2769 hours of sunshine each year, making it one of the sunniest destinations in the Mediterranean region.

Boston, USA, enjoys 2629 hours of sunshine annually, with distinct seasons and many bright, sunny days.

Osaka, Japan, experiences 2010 hours of sunshine annually, with bright, sunny weather in spring and autumn.

In Brisbane, Australia, the annual sunshine averages 2999 hours, making it one of Australia’s sunniest cities.

Other climate information

June, O'Fallon’s wettest month, receives 102 mm of rainfall and has a maximum daytime temperature of 30°C. During the driest month January you can expect a temperature of 5°C.

For more detailed insights into the city’s temperatures, check out our Temperature page. To explore more about precipitation patterns, visit our O'Fallon Precipitation page.